code: def test_delaunay_3d(pointset):
      out = pointset.delaunay_3d()
      assert isinstance(out, pv.UnstructuredGrid)
      assert out.n_cells > 10
  
imports: import numpy
  import pytest
  import vtk
  import pyvista
  from pyvista.core.errors import PointSetCellOperationError, PointSetDimensionReductionError, PointSetNotSupported
label_desc: Use image node_id 20 for calling a global function with example usage: test_delaunay_3d(pointset) without return types